Consequence. Any deformation quantization constructed from a commutative associative algebra \((A,\mu _0)\)  can be obtained by \(v\) -formal deformation, with \(v=Id\)  or \(v=Id-\tau _{12}+c.\)  The \(v\) -algebras with \(v=Id-\tau _{12}+c\)  called weakly-associative algebras have been introduced in [1]} and an algebraic study is presented there.
